gnu/dist/gdb6/opcodes/ip2k-dis.c

   1 /* Disassembler interface for targets using CGEN. -*- C -*-
   2    CGEN: Cpu tools GENerator
   3
   4    THIS FILE IS MACHINE GENERATED WITH CGEN.
   5    - the resultant file is machine generated, cgen-dis.in isn't
   6
   7    Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005
   8    Free Software Foundation, Inc.
   9
  10    This file is part of the GNU Binutils and GDB, the GNU debugger.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 2, or (at your option)
  15    any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software Foundation, Inc.,
  24    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  25
  26 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  27    Keep that in mind.  */
  28
  29 #include "sysdep.h"
  30 #include <stdio.h>
  31 #include "ansidecl.h"
  32 #include "dis-asm.h"
  33 #include "bfd.h"
  34 #include "symcat.h"
  35 #include "libiberty.h"
  36 #include "ip2k-desc.h"
  37 #include "ip2k-opc.h"
  38 #include "opintl.h"
  39
  40 /* Default text to print if an instruction isn't recognized.  */
  41 #define UNKNOWN_INSN_MSG _("*unknown*")
  42
  43 static void print_normal
  44   (CGEN_CPU_DESC, void *, long, unsigned int, bfd_vma, int);
  45 static void print_address
  46   (CGEN_CPU_DESC, void *, bfd_vma, unsigned int, bfd_vma, int) ATTRIBUTE_UNUSED;
  47 static void print_keyword
  48   (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int) ATTRIBUTE_UNUSED;
  49 static void print_insn_normal
  50   (CGEN_CPU_DESC, void *, const CGEN_INSN *, CGEN_FIELDS *, bfd_vma, int);
  51 static int print_insn
  52   (CGEN_CPU_DESC, bfd_vma,  disassemble_info *, bfd_byte *, unsigned);
  53 static int default_print_insn
  54   (CGEN_CPU_DESC, bfd_vma, disassemble_info *) ATTRIBUTE_UNUSED;
  55 static int read_insn
  56   (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, int, CGEN_EXTRACT_INFO *,
  57    unsigned long *);
  58 \f
  59 /* -- disassembler routines inserted here.  */
  60
  61 /* -- dis.c */
  62
  63 static void
  64 print_fr (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  65           void * dis_info,
  66           long value,
  67           unsigned int attrs ATTRIBUTE_UNUSED,
  68           bfd_vma pc ATTRIBUTE_UNUSED,
  69           int length ATTRIBUTE_UNUSED)
  70 {
  71   disassemble_info *info = (disassemble_info *) dis_info;
  72   const CGEN_KEYWORD_ENTRY *ke;
  73   extern CGEN_KEYWORD ip2k_cgen_opval_register_names;
  74   long offsettest;
  75   long offsetvalue;
  76
  77   if (value == 0) /* This is (IP).  */
  78     {
  79       (*info->fprintf_func) (info->stream, "%s", "(IP)");
  80       return;
  81     }
  82
  83   offsettest = value >> 7;
  84   offsetvalue = value & 0x7F;
  85
  86   /* Check to see if first two bits are 10 -> (DP).  */
  87   if (offsettest == 2)
  88     {
  89       if (offsetvalue == 0)
  90         (*info->fprintf_func) (info->stream, "%s","(DP)");
  91       else
  92         (*info->fprintf_func) (info->stream, "$%lx%s", offsetvalue, "(DP)");
  93       return;
  94     }
  95
  96   /* Check to see if first two bits are 11 -> (SP).  */
  97   if (offsettest == 3)
  98     {
  99       if (offsetvalue == 0)
 100         (*info->fprintf_func) (info->stream, "%s", "(SP)");
 101       else
 102         (*info->fprintf_func) (info->stream, "$%lx%s", offsetvalue,"(SP)");
 103       return;
 104     }
 105
 106   /* Attempt to print as a register keyword.  */
 107   ke = cgen_keyword_lookup_value (& ip2k_cgen_opval_register_names, value);
 108
 109   if (ke != NULL)
 110     (*info->fprintf_func) (info->stream, "%s", ke->name);
 111   else
 112     /* Print as an address literal.  */
 113     (*info->fprintf_func) (info->stream, "$%02lx", value);
 114 }
 115
 116 static void
 117 print_dollarhex (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 118                  void * dis_info,
 119                  long value,
 120                  unsigned int attrs ATTRIBUTE_UNUSED,
 121                  bfd_vma pc ATTRIBUTE_UNUSED,
 122                  int length ATTRIBUTE_UNUSED)
 123 {
 124   disassemble_info *info = (disassemble_info *) dis_info;
 125
 126   (*info->fprintf_func) (info->stream, "$%lx", value);
 127 }
 128
 129 static void
 130 print_dollarhex8 (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 131                   void * dis_info,
 132                   long value,
 133                   unsigned int attrs ATTRIBUTE_UNUSED,
 134                   bfd_vma pc ATTRIBUTE_UNUSED,
 135                   int length ATTRIBUTE_UNUSED)
 136 {
 137   disassemble_info *info = (disassemble_info *) dis_info;
 138
 139   (*info->fprintf_func) (info->stream, "$%02lx", value);
 140 }
 141
 142 static void
 143 print_dollarhex_addr16h (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 144                          void * dis_info,
 145                          long value,
 146                          unsigned int attrs ATTRIBUTE_UNUSED,
 147                          bfd_vma pc ATTRIBUTE_UNUSED,
 148                          int length ATTRIBUTE_UNUSED)
 149 {
 150   disassemble_info *info = (disassemble_info *) dis_info;
 151
 152   /* This is a loadh instruction. Shift the value to the left
 153      by 8 bits so that disassembled code will reassemble properly.  */
 154   value = ((value << 8) & 0xFF00);
 155
 156   (*info->fprintf_func) (info->stream, "$%04lx", value);
 157 }
 158
 159 static void
 160 print_dollarhex_addr16l (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 161                          void * dis_info,
 162                          long value,
 163                          unsigned int attrs ATTRIBUTE_UNUSED,
 164                          bfd_vma pc ATTRIBUTE_UNUSED,
 165                          int length ATTRIBUTE_UNUSED)
 166 {
 167   disassemble_info *info = (disassemble_info *) dis_info;
 168
 169   (*info->fprintf_func) (info->stream, "$%04lx", value);
 170 }
 171
 172 static void
 173 print_dollarhex_p (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 174                    void * dis_info,
 175                    long value,
 176                    unsigned int attrs ATTRIBUTE_UNUSED,
 177                    bfd_vma pc ATTRIBUTE_UNUSED,
 178                    int length ATTRIBUTE_UNUSED)
 179 {
 180   disassemble_info *info = (disassemble_info *) dis_info;
 181
 182   value = ((value << 14) & 0x1C000);
 183   ;value = (value  & 0x1FFFF);
 184   (*info->fprintf_func) (info->stream, "$%05lx", value);
 185 }
 186
 187 static void
 188 print_dollarhex_cj (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 189                     void * dis_info,
 190                     long value,
 191                     unsigned int attrs ATTRIBUTE_UNUSED,
 192                     bfd_vma pc ATTRIBUTE_UNUSED,
 193                     int length ATTRIBUTE_UNUSED)
 194 {
 195   disassemble_info *info = (disassemble_info *) dis_info;
 196
 197   value = ((value << 1) & 0x1FFFF);
 198   (*info->fprintf_func) (info->stream, "$%05lx", value);
 199 }
 200
 201 static void
 202 print_decimal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 203                void * dis_info,
 204                long value,
 205                unsigned int attrs ATTRIBUTE_UNUSED,
 206                bfd_vma pc ATTRIBUTE_UNUSED,
 207                int length ATTRIBUTE_UNUSED)
 208 {
 209   disassemble_info *info = (disassemble_info *) dis_info;
 210
 211   (*info->fprintf_func) (info->stream, "%ld", value);
 212 }
 213
 214
 215
 216 /* -- */
 217
 218 void ip2k_cgen_print_operand
 219   (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
 220
 221 /* Main entry point for printing operands.
 222    XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
 223    of dis-asm.h on cgen.h.
 224
 225    This function is basically just a big switch statement.  Earlier versions
 226    used tables to look up the function to use, but
 227    - if the table contains both assembler and disassembler functions then
 228      the disassembler contains much of the assembler and vice-versa,
 229    - there's a lot of inlining possibilities as things grow,
 230    - using a switch statement avoids the function call overhead.
 231
 232    This function could be moved into `print_insn_normal', but keeping it
 233    separate makes clear the interface between `print_insn_normal' and each of
 234    the handlers.  */
 235
 236 void
 237 ip2k_cgen_print_operand (CGEN_CPU_DESC cd,
 238                            int opindex,
 239                            void * xinfo,
 240                            CGEN_FIELDS *fields,
 241                            void const *attrs ATTRIBUTE_UNUSED,
 242                            bfd_vma pc,
 243                            int length)
 244 {
 245   disassemble_info *info = (disassemble_info *) xinfo;
 246
 247   switch (opindex)
 248     {
 249     case IP2K_OPERAND_ADDR16CJP :
 250       print_dollarhex_cj (cd, info, fields->f_addr16cjp, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
 251       break;
 252     case IP2K_OPERAND_ADDR16H :
 253       print_dollarhex_addr16h (cd, info, fields->f_imm8, 0, pc, length);
 254       break;
 255     case IP2K_OPERAND_ADDR16L :
 256       print_dollarhex_addr16l (cd, info, fields->f_imm8, 0, pc, length);
 257       break;
 258     case IP2K_OPERAND_ADDR16P :
 259       print_dollarhex_p (cd, info, fields->f_page3, 0, pc, length);
 260       break;
 261     case IP2K_OPERAND_BITNO :
 262       print_decimal (cd, info, fields->f_bitno, 0, pc, length);
 263       break;
 264     case IP2K_OPERAND_CBIT :
 265       print_normal (cd, info, 0, 0, pc, length);
 266       break;
 267     case IP2K_OPERAND_DCBIT :
 268       print_normal (cd, info, 0, 0, pc, length);
 269       break;
 270     case IP2K_OPERAND_FR :
 271       print_fr (cd, info, fields->f_reg, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
 272       break;
 273     case IP2K_OPERAND_LIT8 :
 274       print_dollarhex8 (cd, info, fields->f_imm8, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
 275       break;
 276     case IP2K_OPERAND_PABITS :
 277       print_normal (cd, info, 0, 0, pc, length);
 278       break;
 279     case IP2K_OPERAND_RETI3 :
 280       print_dollarhex (cd, info, fields->f_reti3, 0, pc, length);
 281       break;
 282     case IP2K_OPERAND_ZBIT :
 283       print_normal (cd, info, 0, 0, pc, length);
 284       break;
 285
 286     default :
 287       /* xgettext:c-format */
 288       fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
 289                opindex);
 290     abort ();
 291   }
 292 }
 293
 294 cgen_print_fn * const ip2k_cgen_print_handlers[] =
 295 {
 296   print_insn_normal,
 297 };
 298
 299
 300 void
 301 ip2k_cgen_init_dis (CGEN_CPU_DESC cd)
 302 {
 303   ip2k_cgen_init_opcode_table (cd);
 304   ip2k_cgen_init_ibld_table (cd);
 305   cd->print_handlers = & ip2k_cgen_print_handlers[0];
 306   cd->print_operand = ip2k_cgen_print_operand;
 307 }
 308
 309 \f
 310 /* Default print handler.  */
 311
 312 static void
 313 print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 314               void *dis_info,
 315               long value,
 316               unsigned int attrs,
 317               bfd_vma pc ATTRIBUTE_UNUSED,
 318               int length ATTRIBUTE_UNUSED)
 319 {
 320   disassemble_info *info = (disassemble_info *) dis_info;
 321
 322 #ifdef CGEN_PRINT_NORMAL
 323   CGEN_PRINT_NORMAL (cd, info, value, attrs, pc, length);
 324 #endif
 325
 326   /* Print the operand as directed by the attributes.  */
 327   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 328     ; /* nothing to do */
 329   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 330     (*info->fprintf_func) (info->stream, "%ld", value);
 331   else
 332     (*info->fprintf_func) (info->stream, "0x%lx", value);
 333 }
 334
 335 /* Default address handler.  */
 336
 337 static void
 338 print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 339                void *dis_info,
 340                bfd_vma value,
 341                unsigned int attrs,
 342                bfd_vma pc ATTRIBUTE_UNUSED,
 343                int length ATTRIBUTE_UNUSED)
 344 {
 345   disassemble_info *info = (disassemble_info *) dis_info;
 346
 347 #ifdef CGEN_PRINT_ADDRESS
 348   CGEN_PRINT_ADDRESS (cd, info, value, attrs, pc, length);
 349 #endif
 350
 351   /* Print the operand as directed by the attributes.  */
 352   if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
 353     ; /* Nothing to do.  */
 354   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
 355     (*info->print_address_func) (value, info);
 356   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
 357     (*info->print_address_func) (value, info);
 358   else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
 359     (*info->fprintf_func) (info->stream, "%ld", (long) value);
 360   else
 361     (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
 362 }
 363
 364 /* Keyword print handler.  */
 365
 366 static void
 367 print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 368                void *dis_info,
 369                CGEN_KEYWORD *keyword_table,
 370                long value,
 371                unsigned int attrs ATTRIBUTE_UNUSED)
 372 {
 373   disassemble_info *info = (disassemble_info *) dis_info;
 374   const CGEN_KEYWORD_ENTRY *ke;
 375
 376   ke = cgen_keyword_lookup_value (keyword_table, value);
 377   if (ke != NULL)
 378     (*info->fprintf_func) (info->stream, "%s", ke->name);
 379   else
 380     (*info->fprintf_func) (info->stream, "???");
 381 }
 382 \f
 383 /* Default insn printer.
 384
 385    DIS_INFO is defined as `void *' so the disassembler needn't know anything
 386    about disassemble_info.  */
 387
 388 static void
 389 print_insn_normal (CGEN_CPU_DESC cd,
 390                    void *dis_info,
 391                    const CGEN_INSN *insn,
 392                    CGEN_FIELDS *fields,
 393                    bfd_vma pc,
 394                    int length)
 395 {
 396   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 397   disassemble_info *info = (disassemble_info *) dis_info;
 398   const CGEN_SYNTAX_CHAR_TYPE *syn;
 399
 400   CGEN_INIT_PRINT (cd);
 401
 402   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 403     {
 404       if (CGEN_SYNTAX_MNEMONIC_P (*syn))
 405         {
 406           (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
 407           continue;
 408         }
 409       if (CGEN_SYNTAX_CHAR_P (*syn))
 410         {
 411           (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
 412           continue;
 413         }
 414
 415       /* We have an operand.  */
 416       ip2k_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
 417                                  fields, CGEN_INSN_ATTRS (insn), pc, length);
 418     }
 419 }
 420 \f
 421 /* Subroutine of print_insn. Reads an insn into the given buffers and updates
 422    the extract info.
 423    Returns 0 if all is well, non-zero otherwise.  */
 424
 425 static int
 426 read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 427            bfd_vma pc,
 428            disassemble_info *info,
 429            bfd_byte *buf,
 430            int buflen,
 431            CGEN_EXTRACT_INFO *ex_info,
 432            unsigned long *insn_value)
 433 {
 434   int status = (*info->read_memory_func) (pc, buf, buflen, info);
 435
 436   if (status != 0)
 437     {
 438       (*info->memory_error_func) (status, pc, info);
 439       return -1;
 440     }
 441
 442   ex_info->dis_info = info;
 443   ex_info->valid = (1 << buflen) - 1;
 444   ex_info->insn_bytes = buf;
 445
 446   *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
 447   return 0;
 448 }
 449
 450 /* Utility to print an insn.
 451    BUF is the base part of the insn, target byte order, BUFLEN bytes long.
 452    The result is the size of the insn in bytes or zero for an unknown insn
 453    or -1 if an error occurs fetching data (memory_error_func will have
 454    been called).  */
 455
 456 static int
 457 print_insn (CGEN_CPU_DESC cd,
 458             bfd_vma pc,
 459             disassemble_info *info,
 460             bfd_byte *buf,
 461             unsigned int buflen)
 462 {
 463   CGEN_INSN_INT insn_value;
 464   const CGEN_INSN_LIST *insn_list;
 465   CGEN_EXTRACT_INFO ex_info;
 466   int basesize;
 467
 468   /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
 469   basesize = cd->base_insn_bitsize < buflen * 8 ?
 470                                      cd->base_insn_bitsize : buflen * 8;
 471   insn_value = cgen_get_insn_value (cd, buf, basesize);
 472
 473
 474   /* Fill in ex_info fields like read_insn would.  Don't actually call
 475      read_insn, since the incoming buffer is already read (and possibly
 476      modified a la m32r).  */
 477   ex_info.valid = (1 << buflen) - 1;
 478   ex_info.dis_info = info;
 479   ex_info.insn_bytes = buf;
 480
 481   /* The instructions are stored in hash lists.
 482      Pick the first one and keep trying until we find the right one.  */
 483
 484   insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
 485   while (insn_list != NULL)
 486     {
 487       const CGEN_INSN *insn = insn_list->insn;
 488       CGEN_FIELDS fields;
 489       int length;
 490       unsigned long insn_value_cropped;
 491
 492 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 493       /* Not needed as insn shouldn't be in hash lists if not supported.  */
 494       /* Supported by this cpu?  */
 495       if (! ip2k_cgen_insn_supported (cd, insn))
 496         {
 497           insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 498           continue;
 499         }
 500 #endif
 501
 502       /* Basic bit mask must be correct.  */
 503       /* ??? May wish to allow target to defer this check until the extract
 504          handler.  */
 505
 506       /* Base size may exceed this instruction's size.  Extract the
 507          relevant part from the buffer. */
 508       if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
 509           (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 510         insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
 511                                            info->endian == BFD_ENDIAN_BIG);
 512       else
 513         insn_value_cropped = insn_value;
 514
 515       if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
 516           == CGEN_INSN_BASE_VALUE (insn))
 517         {
 518           /* Printing is handled in two passes.  The first pass parses the
 519              machine insn and extracts the fields.  The second pass prints
 520              them.  */
 521
 522           /* Make sure the entire insn is loaded into insn_value, if it
 523              can fit.  */
 524           if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
 525               (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
 526             {
 527               unsigned long full_insn_value;
 528               int rc = read_insn (cd, pc, info, buf,
 529                                   CGEN_INSN_BITSIZE (insn) / 8,
 530                                   & ex_info, & full_insn_value);
 531               if (rc != 0)
 532                 return rc;
 533               length = CGEN_EXTRACT_FN (cd, insn)
 534                 (cd, insn, &ex_info, full_insn_value, &fields, pc);
 535             }
 536           else
 537             length = CGEN_EXTRACT_FN (cd, insn)
 538               (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
 539
 540           /* Length < 0 -> error.  */
 541           if (length < 0)
 542             return length;
 543           if (length > 0)
 544             {
 545               CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
 546               /* Length is in bits, result is in bytes.  */
 547               return length / 8;
 548             }
 549         }
 550
 551       insn_list = CGEN_DIS_NEXT_INSN (insn_list);
 552     }
 553
 554   return 0;
 555 }
 556
 557 /* Default value for CGEN_PRINT_INSN.
 558    The result is the size of the insn in bytes or zero for an unknown insn
 559    or -1 if an error occured fetching bytes.  */
 560
 561 #ifndef CGEN_PRINT_INSN
 562 #define CGEN_PRINT_INSN default_print_insn
 563 #endif
 564
 565 static int
 566 default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
 567 {
 568   bfd_byte buf[CGEN_MAX_INSN_SIZE];
 569   int buflen;
 570   int status;
 571
 572   /* Attempt to read the base part of the insn.  */
 573   buflen = cd->base_insn_bitsize / 8;
 574   status = (*info->read_memory_func) (pc, buf, buflen, info);
 575
 576   /* Try again with the minimum part, if min < base.  */
 577   if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
 578     {
 579       buflen = cd->min_insn_bitsize / 8;
 580       status = (*info->read_memory_func) (pc, buf, buflen, info);
 581     }
 582
 583   if (status != 0)
 584     {
 585       (*info->memory_error_func) (status, pc, info);
 586       return -1;
 587     }
 588
 589   return print_insn (cd, pc, info, buf, buflen);
 590 }
 591
 592 /* Main entry point.
 593    Print one instruction from PC on INFO->STREAM.
 594    Return the size of the instruction (in bytes).  */
 595
 596 typedef struct cpu_desc_list
 597 {
 598   struct cpu_desc_list *next;
 599   CGEN_BITSET *isa;
 600   int mach;
 601   int endian;
 602   CGEN_CPU_DESC cd;
 603 } cpu_desc_list;
 604
 605 int
 606 print_insn_ip2k (bfd_vma pc, disassemble_info *info)
 607 {
 608   static cpu_desc_list *cd_list = 0;
 609   cpu_desc_list *cl = 0;
 610   static CGEN_CPU_DESC cd = 0;
 611   static CGEN_BITSET *prev_isa;
 612   static int prev_mach;
 613   static int prev_endian;
 614   int length;
 615   CGEN_BITSET *isa;
 616   int mach;
 617   int endian = (info->endian == BFD_ENDIAN_BIG
 618                 ? CGEN_ENDIAN_BIG
 619                 : CGEN_ENDIAN_LITTLE);
 620   enum bfd_architecture arch;
 621
 622   /* ??? gdb will set mach but leave the architecture as "unknown" */
 623 #ifndef CGEN_BFD_ARCH
 624 #define CGEN_BFD_ARCH bfd_arch_ip2k
 625 #endif
 626   arch = info->arch;
 627   if (arch == bfd_arch_unknown)
 628     arch = CGEN_BFD_ARCH;
 629
 630   /* There's no standard way to compute the machine or isa number
 631      so we leave it to the target.  */
 632 #ifdef CGEN_COMPUTE_MACH
 633   mach = CGEN_COMPUTE_MACH (info);
 634 #else
 635   mach = info->mach;
 636 #endif
 637
 638 #ifdef CGEN_COMPUTE_ISA
 639   {
 640     static CGEN_BITSET *permanent_isa;
 641
 642     if (!permanent_isa)
 643       permanent_isa = cgen_bitset_create (MAX_ISAS);
 644     isa = permanent_isa;
 645     cgen_bitset_clear (isa);
 646     cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
 647   }
 648 #else
 649   isa = info->insn_sets;
 650 #endif
 651
 652   /* If we've switched cpu's, try to find a handle we've used before */
 653   if (cd
 654       && (cgen_bitset_compare (isa, prev_isa) != 0
 655           || mach != prev_mach
 656           || endian != prev_endian))
 657     {
 658       cd = 0;
 659       for (cl = cd_list; cl; cl = cl->next)
 660         {
 661           if (cgen_bitset_compare (cl->isa, isa) == 0 &&
 662               cl->mach == mach &&
 663               cl->endian == endian)
 664             {
 665               cd = cl->cd;
 666               prev_isa = cd->isas;
 667               break;
 668             }
 669         }
 670     }
 671
 672   /* If we haven't initialized yet, initialize the opcode table.  */
 673   if (! cd)
 674     {
 675       const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
 676       const char *mach_name;
 677
 678       if (!arch_type)
 679         abort ();
 680       mach_name = arch_type->printable_name;
 681
 682       prev_isa = cgen_bitset_copy (isa);
 683       prev_mach = mach;
 684       prev_endian = endian;
 685       cd = ip2k_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
 686                                  CGEN_CPU_OPEN_BFDMACH, mach_name,
 687                                  CGEN_CPU_OPEN_ENDIAN, prev_endian,
 688                                  CGEN_CPU_OPEN_END);
 689       if (!cd)
 690         abort ();
 691
 692       /* Save this away for future reference.  */
 693       cl = xmalloc (sizeof (struct cpu_desc_list));
 694       cl->cd = cd;
 695       cl->isa = prev_isa;
 696       cl->mach = mach;
 697       cl->endian = endian;
 698       cl->next = cd_list;
 699       cd_list = cl;
 700
 701       ip2k_cgen_init_dis (cd);
 702     }
 703
 704   /* We try to have as much common code as possible.
 705      But at this point some targets need to take over.  */
 706   /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
 707      but if not possible try to move this hook elsewhere rather than
 708      have two hooks.  */
 709   length = CGEN_PRINT_INSN (cd, pc, info);
 710   if (length > 0)
 711     return length;
 712   if (length < 0)
 713     return -1;
 714
 715   (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
 716   return cd->default_insn_bitsize / 8;
 717 }